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Speaker amps for headphones - Page 126

post #1876 of 3116
Quote:
Originally Posted by potterma View Post


Hmmmm... It was an NKK DPDT switch that I didn't like. Diminished high frequency clarity and resolution compared to a reed relay. This was a silver plated copper contact version of the toggle switch. Maybe I should have gone good contacts?

Can you link the switch in question?

post #1877 of 3116
Quote:
Originally Posted by brunk View Post

Can you link the switch in question?
I'll have to look it up tomorrow evening.
post #1878 of 3116

Pfft, if you guys are going for versatility then just set up a rotary switch ladder attenuator that can simultaneously adjust the divider and output impedance. If you're sneaky you can do it all on one switch.

 

 

post #1879 of 3116
Quote:
Originally Posted by Armaegis View Post
 

Pfft, if you guys are going for versatility then just set up a rotary switch ladder attenuator that can simultaneously adjust the divider and output impedance. If you're sneaky you can do it all on one switch.

 

 

 

Ahh, that would be exquisitely excessive lol :wink_face:

post #1880 of 3116

Oops, I meant rotary switch series stepped attenuator. Well, I guess both are doable depending how you jingle the wiring.

post #1881 of 3116

Aw heck, why waste all that energy into resistors. Let's get into some autoformer shenanigans!

post #1882 of 3116
Quote:
Originally Posted by Armaegis View Post
 

Aw heck, why waste all that energy into resistors. Let's get into some auto-transformer shenanigans!

 

Who's Otto?

post #1883 of 3116
Quote:
Originally Posted by Chris J View Post
 

 

Who's Otto?

 

Octavius. Guy with eight arms. Also currently...

Warning: Big Spoiler! (Click to show)
the new Superior Spiderman

(spoiler for those who read Marvel comics and haven't caught up in the past several months)

post #1884 of 3116

Okay, so when you guys have designed truly magic boxes that automatically (or even manually, with safeguards) adjust attenuation, etc. depending on which amp is connected on on side and which cans are connected on the other... I'll buy one from whoever builds one that works, assuming the price is reasonable (a few hundred bucks?)

 

I'm waiting....

post #1885 of 3116
Quote:
Originally Posted by Armaegis View Post
 

 

Octavius. Guy with eight arms. Also currently...

Warning: Big Spoiler! (Click to show)
the new Superior Spiderman

(spoiler for those who read Marvel comics and haven't caught up in the past several months)

 

What does he have to do with transformers? :confused_face_2:

post #1886 of 3116

Here's the resistor network bypass switch details:

4PDT_switch2.jpg

4PDT_switch_terminals.jpg

Switch Up = Resistor Network Bypass. Switch Down = Resistor Network Active.

Lot's of soldering. . .

post #1887 of 3116
Quote:
Originally Posted by robrob View Post
 

Here's the resistor network bypass switch details:

4PDT_switch2.jpg

4PDT_switch_terminals.jpg

Switch Up = Resistor Network Bypass. Switch Down = Resistor Network Active.

Lot's of soldering. . .

At first, something seemed amiss. However your wiring for 4-pin XLR is correct, I see that you went out of order on the L/R terminals. Did you do that for ease of wiring or something? One tip, if you haven't done this sort of thing before. Make a good mechanical connection of wire-terminal first, and then use a low melting point solder. I don't recommend using flux though, it could get really messy inside the switch.

post #1888 of 3116

The pin order matches up with the box's speaker binding posts (actually it doesn't because I forgot to consider the switch is facing the opposite direction as the binding posts-I'll have to fix that).

 

Edit: fixed the switch pic.


Edited by robrob - 12/13/13 at 4:59pm
post #1889 of 3116
Quote:
Originally Posted by robrob View Post
 

The pin order matches up with the box's speaker binding posts (actually it doesn't because I forgot to consider the switch is facing the opposite direction as the binding posts-I'll have to fix that).

Don't forget to twist those corresponding pairs really good too! ;) 

 

EDIT: Are you using a plastic or metal box for this? You may want to get some copper foil if plastic to at least provide a little shielding, and you can wrap it around the wires too.


Edited by brunk - 12/13/13 at 10:37am
post #1890 of 3116
Quote:
Originally Posted by Chris J View Post
 

 

What does he have to do with transformers? :confused_face_2:

 

 

Quote:
Originally Posted by Chris J View Post
 

 

Who's Otto?

 

Nothing really, but you asked about Otto... so I told you about Otto.

 

 

Quote:
Originally Posted by Gary in MD View Post
 

Okay, so when you guys have designed truly magic boxes that automatically (or even manually, with safeguards) adjust attenuation, etc. depending on which amp is connected on on side and which cans are connected on the other... I'll buy one from whoever builds one that works, assuming the price is reasonable (a few hundred bucks?)

 

I'm waiting....

 

"simple" option: make the divider with a shunt-style stepped attenuator, maybe 3 steps at most (bypass, and two attenuation values), put the shunt on the bottom leg so that's your constant.

 

"is he serious?" option: wired in reverse... http://www.zeroimpedance.com/Zero-New.html

 

 

I still think y'all are drinking the kool-aid.

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